Apc Silcon DP300E Series User Manual download pdf (Page 14)

14 User Guide Silcon DP300E Series 480V 400-500kVA

7OA0004 US rev. 02

DP300E

Q010a

Q001a

Q002a

Q004

Q010b

Q001b Q002b

Utility 1

Q003

Service bypass switch

H003

Load

Utility 2

H004

H002b

H002a

H010a

H010b

Single Utility

Dual Utility

2.5.3 Isolating one UPS for service/maintenance

In a redundant system one UPS can be isolated for service/maintenance without

affecting the other parallel UPS(s).

1. Check that the remaining UPS(s) will be able to carry the load when one UPS is

isolated.

2. Switch off the system to be isolated for maintenance by pushing the red “OFF”

push-button.

3. Disconnect output and utility by turning output switch (Q002) to position “0”

and input switch (Q001) to position “0”, disconnect battery by opening battery

MCCB.

If dual utility is present, turn the bypass input switch (Q010) to position “0”.

Switching back the UPS to normal parallel/redundant operation

1. Turn the input switch (Q001) and the output switch (Q002) to position “1”.

If dual utility is present, turn the bypass input switch (Q010) to position “1”.

2. Charge capacitors, connect battery and start up the UPS as described in

chapter 2.5.

The UPS will automatically switch to normal operation and start load sharing

with the other parallelled UPS(s).

Stop, Start & Operating the External Service Bypass Panel

WARNING!

The system will discharge built-

in capacitors. However, before

working on the system check

with a multimeter that there is

no dangerous voltage on the

terminals.

DP300E

Q003

Service

bypass

switch

H003

Q001a

Q001b

Q002b

Q004

Q002a

LoadUtility

H004

H002aH002b

NOTE:

When Q002 is in position “0”

the UPS can be operated and

tested as a single system

without affecting the other

parallel UPS(s) if proper

monitoring has been installed.

Available on all APC bypass

panels.

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